Transmission Availability Data System Automatic … Availability Data System... · This report covers Phase I Automatic Outage data2. ... example, only one region in NERC has DC Circuits

Transmission Availability Data System Automatic Outage Metrics and Data

NERC – 2009 Report

June 14, 2010

Transmission Availability Data System, NERC - 2009 Report NERC i June 14, 2010

TTaabbllee ooff CCoonntteennttss 1 Introduction ........................................................................................................... 1

1.1 Contributors and Acknowledgements......................................................................... 1 1.2 TADS History ................................................................................................................ 1 1.3 Scope............................................................................................................................... 1 1.4 TADS Reports – NERC, Regional, and Transmission Owner ................................. 2 1.5 Confidential Data Not Publicly Reported ................................................................... 2 1.6 Report Organization ..................................................................................................... 3

1.6.1 Table and Figure Labeling ................................................................................ 3 1.6.2 Tables and Figures Data Categories ................................................................. 3 1.6.3 Tables and Figures Data Display Conventions ................................................. 3

1.7 Feedback and Comments ............................................................................................. 4

2 NERC Metrics and Data Summary ...................................................................... 8

2.1 Element Inventory Data ............................................................................................... 8 2.2 Element Outage Frequency and Duration Metrics .................................................... 8 2.3 Event Types ................................................................................................................. 14

3 NERC Metrics and Data Details ......................................................................... 15

3.1 AC Circuit Metrics and Data ..................................................................................... 15 3.1.1 AC Circuit Sustained Outages ........................................................................ 15

3.1.1.1 AC Circuit Sustained Outage Initiation Code Metrics .......................... 15 3.1.1.2 AC Circuit Sustained Outage Cause Code Data .................................... 17 3.1.1.3 Other AC Circuit Sustained Outage Data .............................................. 19

3.1.2 AC Circuit Momentary Outages ..................................................................... 23 3.1.2.1 AC Circuit Momentary Outage Initiation Code Metrics ....................... 23 3.1.2.2 AC Circuit Momentary Outage Cause Code Data ................................. 23 3.1.2.3 Other AC Circuit Momentary Outage Data ........................................... 24

3.1.3 Total AC Circuit Metrics ................................................................................ 25 3.2 DC Circuit Metrics and Data ..................................................................................... 27

3.2.1 DC Circuit Sustained Outages ........................................................................ 27 3.2.1.1 DC Circuit Sustained Outage Initiation Code Metrics .......................... 27 3.2.1.2 DC Circuit Sustained Outage Cause Code Data .................................... 29 3.2.1.3 Other DC Circuit Sustained Outage Data .............................................. 30

3.2.2 DC Circuit Momentary Outages ..................................................................... 33 3.2.2.1 DC Circuit Momentary Outage Initiation Code Metrics ....................... 33 3.2.2.2 DC Circuit Momentary Outage Cause Code Data ................................. 34 3.2.2.3 Other DC Circuit Momentary Outage Data ........................................... 34

3.2.3 Total DC Circuit Metrics ................................................................................ 35 3.3 Transformer Metrics and Data .................................................................................. 37

3.3.1 Transformer Sustained Outages ...................................................................... 37 3.3.1.1 Transformer Sustained Outage Initiation Code Metrics ........................ 37 3.3.1.2 Transformer Sustained Outage Cause Code Data .................................. 38

Transmission Availability Data System, NERC - 2009 Report NERC ii June 14, 2010

3.3.1.3 Other Transformer Sustained Outage Data ............................................ 40 3.3.2 Transformer Momentary Outages ................................................................... 44

3.3.2.1 Transformer Momentary Outage Initiation Code Metrics ..................... 44 3.3.2.2 Transformer Momentary Outage Cause Code Data ............................... 44 3.3.2.3 Other Transformer Momentary Outage Data ......................................... 45

3.3.3 Total Transformer Metrics .............................................................................. 46 3.4 AC/DC BTB Converter Metrics and Data ................................................................ 48

3.4.1 AC/DC BTB Converter Sustained Outages .................................................... 48 3.4.1.1 AC/DC BTB Converter Sustained Outage Initiation Code Metrics ...... 48 3.4.1.2 AC/DC BTB Converter Sustained Outage Cause Code Data ................ 49 3.4.1.3 Other AC/DC BTB Converter Sustained Outage Data .......................... 50

3.4.2 AC/DC BTB Converter Momentary Outages ................................................. 53 3.4.2.1 AC/DC BTB Converter Momentary Outage Initiation Code Metrics ... 53 3.4.2.2 AC/DC BTB Converter Momentary Outage Cause Code Data............. 53 3.4.2.3 Other AC/DC BTB Converter Momentary Outage Data ....................... 54

3.4.3 Total AC/DC BTB Converter Metrics ............................................................ 56

Appendix 1 TADS Definitions

Appendix 2 Metric Definitions

Appendix 3 TADS Working Group Members

Introduction

Transmission Availability Data System, NERC - 2009 Report NERC 1 June 14, 2010

11 IInnttrroodduuccttiioonn 1.1 Contributors and Acknowledgements The North American Electric Reliability Corporation (NERC) gratefully acknowledges the support of the Transmission Availability Data System Working Group (TADSWG), Open Access Technologies International (OATI),) and in 2009 the 192 reporting Transmission Owners (TOs) in NERC. The 2009 “Reporting TOs” are TOs that own any TADS facilities, as described in Section 1.3 below, as of January 1, 2009.

• TADS Phase I participation is mandatory for all U.S. TOs on the NERC Compliance Registry, and all of the NERC TOs complied.1

• Participation is voluntary for Mexican and Canadian TOs on the NERC Compliance Registry, and all non-U.S. TOs in NERC except one voluntarily provided data.

In addition to TOs, TADS Regional Entity coordinators (RECs) in NERC, and NERC TADS administrators supported the effort.

1.2 TADS History The TADS effort began with the establishment of a task force (TADSTF) under the direction of NERC Planning Committee in October 2006. On October 27, 2007, the NERC Board of Trustees approved the collection of TADS Phase I data beginning in calendar year 2008. Phase I covers Automatic Outage data (and the reader is referred to Appendix 1 for the definition of capitalized Phase I terms).

Subsequently, on October 29, 2008, the NERC Board approved the collection of Non-Automatic Outage data that will begin in calendar year 2010 (Phase II). On July 1, 2009 the TADSTF was converted to the TADSWG by the NERC Planning Committee.

1.3 Scope This report covers Phase I Automatic Outage data2. The 2009 Report is based upon 2009 calendar year data submitted by Transmission Owners by March 1, 2010.

Phase I TADS includes Momentary and Sustained Automatic Outages of the following Elements:

• AC Circuits ≥ 200 kV (Overhead and Underground Circuits). Radial circuits are included;

• DC Circuits with ≥ +/-200 kV DC voltage; • Transformers with ≥ 200 kV low-side voltage; and • AC/DC Back-to-Back (BTB) Converters with ≥ 200 kV AC voltage, both sides.

1 For TADS, three U.S. companies in NERC that operate multiple NERC-registered TOs were allowed to submit one TADS set of data for their combined TOs. See NERC ID Exceptions for TADS Data posted at NERC ID Exceptions. 2 Phase II data will be reported next year.

Introduction


The following basic information is collected:

• Automatic Outage Data: o Event ID & Event Type o Outage ID code o Fault Type o Outage Initiation Code o Outage Start Time o Outage Duration o Outage Cause Codes

Initiating Sustained

o Outage Mode • Element Inventory Summary:

o Number of Elements o For AC and DC Circuits, Circuit Miles o For AC and DC Circuits, AC and DC Multi-Circuit Structure Miles.

1.4 TADS Reports – NERC, Regional, and Transmission Owner For calendar year 2009, one NERC-wide report and eight regional reports have been produced, using a common format, and these reports are posted on the TADSWG page on the NERC Web site. The definitions are a separate document that may be downloaded at http://www.nerc.com/docs/pc/tadstf/Appendix_1_TADS_2008_Reports_(All).pdf. These definitions were posted on September 11, 2008 for use during calendar year 2009 data collection.

In addition, each report has an associated Excel workbook that contains non-confidential data from webTADS as well as all of the associated tables and figures in the report that were developed from that data. Those workbooks are posted on the TADS Web site along with each report.

The purpose of this report is to provide the results of the annual 2009 data collection. Moving forward the TADSWG and other NERC groups may separately provide observations, interpretations of the annual results, and suggest further areas for study. It is recommended that readers of this report not draw conclusions based on the 2008 and 2009 calendar year data collection as it will take a number of years of data to provide interpretations with a high degree of confidence.

1.5 Confidential Data Not Publicly Reported Per the data confidentiality policy, the report does not display performance data associated with a TADS Element in a Voltage Class or for circuits of a particular construction type (Overhead or Underground) if all of the Elements in that Voltage Class and applicable construction type are reported by one TO.3 In this report, confidential performance data has not been displayed for the following Elements, Voltage Classes, and construction types that are reported by one TO in NERC:

3 NERC will ask the impacted TOs for permission beginning with the calendar year 2010 report.

Introduction


1. AC Circuits – one TO reported all of the Underground 400-599 kV AC Circuit Performance Data in NERC. Therefore, no Underground 400-599 kV AC Circuit performance data is displayed in this report.

2. DC Circuits – one TO reported all the 200-299 kV DC Circuit performance data in NERC. In addition, one TO reported all of the Underground 400-499 kV and 500-599 kV DC Circuit performance data in NERC. Therefore, no 200-299 kV DC Circuit performance data or Underground 400-499 kV and 500-599 kV DC Circuit performance data is displayed in this report.

Where Underground circuit performance data for the above voltage classes have been excluded, that data is also excluded from the combined total (Overhead plus Underground) performance data.

1.6 Report Organization Section 2 has summary NERC metrics and data for each of the reported Elements while Section 3 has more detailed data for these same Elements, with separate subsections devoted to each Element (e.g., Section 3.1 for AC Circuits, Section 3.3 for Transformers, etc.).

1.6.1 Table and Figure Labeling Table NERC 1-1 shows the assigned numbering scheme for the tables and figures in this report. The prefix “NERC” indicates the region covered by the report. The table and figure numbering scheme includes the major report section heading (e.g., Section 1, 2, 3.1, etc.) followed by a “dash” and then followed by a number (e.g., 1, 2, 3, etc.) that reflects the order that the table or figure appear in the report. Any tables or figures that are purposely omitted in this report are highlighted in the Table NERC 1-1. Tables or figures may be omitted because (i) they have no data because there are no Elements, or (ii) they contain confidential TO data, or (iii) there were no reported outages.

1.6.2 Tables and Figures Data Categories The working group elected to use a common NERC-wide template for each of the tables and figures displaying performance data. The template only includes data categories (i.e., Voltage Class and construction type) for Elements that are found within NERC. The use of a common NERC-wide template allows for all reports (regional and NERC) to utilize a familiar format while making production easier. Table NERC 1-2 shows the categories included in the NERC template.

Performance data are not shown in Tables NERC 2-1 and NERC 2-2. These tables show, respectively, the Inventory of AC equipment and DC equipment within NERC. The working group felt that a complete snapshot of all TADS categories was needed, including categories with zero inventories in NERC.

1.6.3 Tables and Figures Data Display Conventions Some regions do not have any Elements in a Voltage Class, but since those Elements exist elsewhere within NERC, the NERC template has a row or column for them. For example, only one region in NERC has DC Circuits in the 200-299 kV Voltage Class. That Voltage Class is contained in all DC Circuit tables in the NERC and all regional

Introduction


reports because the template is NERC-wide. However, the working group took these steps to assist the reader in viewing such tables:

1. Appendix 2 contains the metric definitions along with their acronyms. These acronyms are used frequently in tables and figures.

2. If there are no Elements of a particular Voltage Class and applicable construction type in a region, performance data in a table such as the number of Sustained Outages is shown as a “dash” and not a zero. Also, all calculations that would normally use that data are shown as a “dash.”

3. If there are Elements in a Voltage Class and applicable construction type, but the performance data displayed for that Element is equal to zero (for example, the number of Sustained Outages is equal to zero), a “0” is shown. In this case, if a computation using that data would result in a division by zero, a “tilde” (~) is shown for the results of that computation. This avoids the Excel “#DIV/0!” display.

4. If there are Elements in a Voltage Class and applicable construction type, but the performance data may not be displayed because it is confidential, all performance data for that Voltage Class and applicable construction type is removed and a “C” is displayed for that data. However, as explained in Section 2-3, Table NERC 2-3 (Event Types and Outages) generally includes all outage data because it does not reveal any confidential data; however, if it would reveal confidential performance data, that data would have a “C” displayed.

5. In each report subsection devoted to a specific Element (e.g., Section 3.1 for AC Circuits), separate tables display total (a) Element-Initiated Outages and (b) Other than Element-Initiated Outages for Sustained Outages by Voltage Class, and similar tables display the this data for Momentary Outages. These tables also compute metrics on a per Element basis, such as SOF. As described above, confidential performance data for a specific Voltage Class is displayed as a “C.” However, since these tables also compute per Element metrics for “All Voltages,” the “All Voltages “calculations would be incorrect if confidential performance data in a Voltage Class are excluded while non-confidential associated inventory data are included. Therefore, an “NC” has been displayed in the inventory data to ensure the correctness of the computations.4

6. If a cell is not supposed to contain data, a grayed pattern is inserted in that cell. For example, Circuit Miles are not applicable to Transformers.

1.7 Feedback and Comments Readers may submit comments and feedback to [email protected] at any time. At present, NERC is interested in report content suggestions, such as (i) the way the report is organized (ii) the way data are displayed and (iii) the type of data that should be reported. If changes are requested, please describe the benefits of each suggested change. NERC will use this feedback to develop and improve future reports.

4 The Excel “SUM” function treats text such as “C” or “NC” as a zero.

Introduction


Table NERC 1-1 TADS Report Tables and Figure Guide – NERC Report

Tables omitted because they have no data, contain confidential TO data, or have no reported outages are shaded as follows:

Section No. and Name Table Title Table No. Figure No. 1. Introduction TADS Report Tables and Figures Guide NERC 1-1

Categories Displayed in Report Tables and Figures with Performance Data NERC 1-2 2. Summary NERC Metrics and Data Inventory of AC Transmission Equipment NERC 2-1

Inventory of DC Transmission Equipment NERC 2-2 AC Circuit Outage Frequency by Outage Initiation Code NERC 2-1 AC Circuit Outage Duration by Outage Initiation Code NERC 2-2 DC Circuit Outage Frequency by Outage Initiation Code NERC 2-3 DC Circuit Outage Duration by Outage Initiation Code NERC 2-4 Transformer Outage Frequency by Outage Initiation Code NERC 2-5 Transformer Outage Duration by Outage Initiation Code NERC 2-6 AC/DC BTB Converter Outage Frequency by Outage Initiation Code NERC 2-7 AC/DC BTB Converter Outage Duration by Outage Initiation Code NERC 2-8 Event Types and Outages NERC 2-3

3.1 AC Circuit Metrics and Data AC Circuit Sustained Outage – Element-Initiated Only NERC 3.1-1 AC Circuit Sustained Outage Metrics – Other than “Element-Initiated” NERC 3.1-2 AC Circuit Sustained Outages by Cause Code NERC 3.1-3 AC Circuit Sustained Outages – Other Attributes NERC 3.1-4 AC Circuit Momentary Outage Metrics – Element-Initiated Only NERC 3.1-5 AC Circuit Momentary Outage Metrics – Other than “Element-Initiated” NERC 3.1-6 AC Circuit Momentary Outages by Cause Code NERC 3.1-7 AC Circuit Momentary Outages – Other Attributes NERC 3.1-8 AC Circuit Metrics 1-16 per Appendix 2 NERC 3.1-9

3.2 DC Circuit Metrics and Data DC Circuit Sustained Outage Metrics and Data – Element-Initiated Only NERC 3.2-1 DC Circuit Sustained Outage Metrics – Other than “Element-Initiated” NERC 3.2-2 DC Circuit Sustained Outages by Cause Code NERC 3.2-3 DC Circuit Sustained Outages – Other Attributes NERC 3.2-4 DC Circuit Momentary Outage Metrics – Element-Initiated Only NERC 3.2-5 DC Circuit Momentary Outage Metrics – Other than “Element-Initiated” NERC 3.2-6 DC Circuit Momentary Outages by Cause Code NERC 3.2-7 DC Circuit Momentary Outages – Other Attributes NERC 3.2-8 DC Circuit Metrics 1-16 per Appendix 2 NERC 3.2-9

Introduction


Table NERC 1-1 (cont’d) 3.3 Transformer Metrics and Data Transformer Sustained Outage Metrics – Element-Initiated Only NERC 3.3-1

Transformer Sustained Outage Metrics – Other than “Element-Initiated” NERC 3.3-2 Transformer Sustained Outages by Cause Code NERC 3.3-3 Transformer Sustained Outages – Other Attributes NERC 3.3-4 Transformer Momentary Outage Metrics – Element-Initiated Only NERC 3.3-5 Transformer Momentary Outage Metrics – Other than “Element-Initiated” NERC 3.3-6 Transformer Momentary Outages by Cause Code NERC 3.3-7 Transformer Momentary Outages – Other Attributes NERC 3.3-8 Transformer Metrics 1-10 per Appendix 2 NERC 3.3-9

3.4 AC/DC BTB Converter Metrics and Data AC/DC BTB Converter Sustained Outage Metrics – Element-Initiated Only NERC 3.4-1 AC/DC BTB Converter Sustained Outage Metrics – Other than “Element-Initiated” NERC 3.4-2 AC/DC BTB Converter Sustained Outages by Cause Code NERC 3.4-3 AC/DC BTB Converter Sustained Outages – Other Attributes NERC 3.4-4 AC/DC BTB Converter Momentary Outage Metrics – Element-Initiated Only NERC 3.4-5 AC/DC BTB Converter Momentary Outage Metrics – Other than “Element-Initiated” NERC 3.4-6 AC/DC BTB Converter Momentary Outages by Cause Code NERC 3.4-7 AC/DC BTB Converter Momentary Outages – Other Attributes NERC 3.4-8 AC/DC BTB Converter Metrics 1-10 per Appendix 2 NERC 3.4-9

Tables omitted because they have no data, contain confidential TO data, or have no reported outages are shaded as follows:

Introduction


Table NERC 1-2 Categories Displayed in Report Tables and Figures with Performance Data

Based upon the NERC Inventory5

Category Voltage Class

200-299 kV OH UG300-399 kV OH UG400-599 kV OH UG600-799 kV OH UG

200-299 kV300-399 kV400-599 kV600-799 kV

Mixed Voltages

200-299 kV OH UG300-399 kV OH UG400-499 kV OH UG500-599 kV OH UG600-799 kV OH UG

200-299 kV300-399 kV400-499 kV500-599 kV600-799 kV

Mixed Voltages

200-299 kV300-399 kV400-599 kV600-799 kV

200-299 kV300-399 kV400-599 kV600-799 kV

Transformers

AC/DC BTB Converters

No categories of this type exist within NERC

DC Circuit

DC Multi-Circuit Structure Miles

Construction type (Overhead or Underground)

AC Circuit

AC Multi-Circuit Structure Miles

5 For performance tables and figures, only the categories above are shown. As noted in Section 1.6.2, Tables 2-1 and 2-2 have inventory data for all the Voltage Classes.

NERC Metrics and Data Summary


22 NNEERRCC MMeettrriiccss aanndd DDaattaa SSuummmmaarryy This section reports overall Element inventory data as well as two measures of Element performance - outage frequency for both Sustained and Momentary Outage Frequency (SOF and MOF) and Sustained Outage Duration Time (SODT) – on a per Element basis. The number of Elements shown in the inventory data was used to compute the “per Element” frequency and duration metrics. Figure NERC 2-1 through Figure NERC 2-8 show frequency and duration metrics on a different scale for each Element. The scale was dictated by the Element’s data. Finally, the report provides the number and percentage of Events for each Event Type.

2.1 Element Inventory Data The inventory data, summarized in two tables, NERC 2-1 and NERC 2-2 shows the average Element inventory for calendar year 2009 for AC transmission equipment and DC transmission equipment respectively. All Voltage Classes available for collection are included in these tables. Because TADS uses an equivalent (or average) inventory, the number of reported Elements will generally not be a whole number. As an example, an AC Circuit that is added in the middle of a reporting period will be shown as 0.5 of an AC Circuit in the inventory. This accurately reflects the exposure of Elements to outages.

2.2 Element Outage Frequency and Duration Metrics Two figures for each TADS Element (AC Circuits, DC Circuits, Transformers, and AC/DC Back-to-Back Converters) are shown in this section.

• The first figure shows the Sustained Outage and Momentary Outage Frequency (SOF and MOF) by Outage Initiation Code.

• The second figure shows the Sustained Outage Duration Time per Element (SODT) by Outage Initiation Code.



Table NERC 2-1

NameEquiv. No. Elements

Circuit Miles

Equiv. No. Elements

Circuit Miles

Equiv. No. Elements

Circuit Miles

Equiv. No. Elements

Circuit Miles

Equiv. No. Elements

Circuit Miles

Equiv. No. Elements

Circuit Miles

AC Circuit ‐ All 4477.5 103558 1623.6 56791 594.7 32184 110 9451 6805.7 201985Overhead 4363.5 103039 1559.6 56338 592.7 32099 110 9451 6625.8 200927

Underground 114.0 519 64 453 2 85 0 0 180 1058AC Multi‐Circuit Structure Miles*

17140 8548 1944 0 540 28173

Transformer 32 164.9 415.7 93 705.6

* The data shown for AC Multi‐Circuit Structure Miles is Multi‐Circuit Structure Miles, not Circuit Miles.

Inventory of AC Transmission EquipmentAll Voltages200‐299 kV 300‐399 kV 400‐599 kV 600‐799 kV Mixed Voltages

Table NERC 2-2

NameEquiv. No. Elements

Circuit Miles

Equiv. No. Elements

Circuit Miles

Equiv. No. Elements

Circuit Miles

Equiv. No. Elements

Circuit Miles

Equiv. No. Elements

Circuit Miles

Equiv. No. Elements

Circuit Miles

DC Circuit ‐ All 4 1022 0 0 10 2920 7 3368 0 0 21 7310Overhead 4 1022 0 0 8 2917 6 3302 0 0 18 7241

Underground 0 0 0 0 2 3 1 66 0 0 3 69DC Multi‐Circuit Structure Miles*

511 0 1458 1651 0 3620

NameAC/DC BTB Converters**

7 7 0 0 14

* The data shown for DC Multi‐Circuit Structure Miles is Multi‐Circuit Structure Miles, not Circuit Miles.** AC/DC BTB Converter Voltage Classes are the highest AC Voltage Class of the two AC voltages on either side of the converter.

600‐799 kV All Voltages200‐299 kV 300‐399 kV 400‐599 kV

Inventory of DC Transmission EquipmentAll Voltages200‐299 kV 300‐399 kV 400‐499 kV 500‐599 kV 600‐799 kV



Figure NERC 2-1 AC Circuit Outage Frequency by Outage Initiation Code

0.00

0.10

0.20

0.30

0.40

0.50

0.60

200‐299 kV SOF

200‐299 kV MOF

300‐399 kV SOF

300‐399 kV MOF

400‐599 kV SOF

400‐599 kV MOF

600‐799 kV SOF

600‐799 kV MOF

No. of O

utages (p

er AC Circuit p

er yr.)

Other Facility‐Initiated

AC/DC Terminal‐Initiated

AC Substation‐Initiated

Other Element‐Initiated

Element‐Initiated

Figure NERC 2-2 AC Circuit Outage Duration by Outage Initiation Code

0.0

5.0

10.0

15.0

20.0

25.0

30.0

35.0

40.0

200‐299 kV SODT

300‐399 kV SODT

400‐599 kV SODT

600‐799 kV SODT

Out

age

Dur

atio

n (h

r. pe

r AC

Circ

uit p

er y

r.)





Element‐Initiated



Figure NERC 2-3 DC Circuit Outage Frequency by Outage Initiation Code

0.00

1.00

2.00

3.00

4.00

5.00

6.00

7.00

200‐299 kV SOF

200‐299 kV MOF

400‐499 kV SOF

400‐499 kV MOF

500‐599 kV SOF

500‐599 kV MOF

No. of O

utages (p

er DC Circuit p

er yr.)

Other Facility‐InitiatedAC/DC Terminal‐InitiatedAC Substation‐InitiatedOther Element‐InitiatedElement‐Initiated

Figure NERC 2-4 DC Circuit Outage Duration by Outage Initiation Code

0.00

5.00

10.00

15.00

20.00

25.00

30.00

35.00

40.00

45.00

200‐299 kV SODT 400‐499 kV SODT 500‐599 kV SODT

Out

age

Dur

atio

n (h

r. pe

r DC

Circ

uit p

er y

r.)





Element‐Initiated



Figure NERC 2-5 Transformer Outage Frequency by Outage Initiation Code

0.00

0.05

0.10

0.15

0.20

0.25

200‐299 kV SOF

200‐299 kV MOF

300‐399 kV SOF

300‐399 kV MOF

400‐599 kV SOF

400‐599 kV MOF

600‐799 kV SOF

600‐799 kV MOF

No. of O

utages (p

er Transform

er per yr.)





Element‐Initiated

Figure NERC 2-6 Transformer Outage Duration by Outage Initiation

0.0

20.0

40.0

60.0

80.0

100.0

120.0

140.0

160.0

200‐299 kV SODT

300‐399 kV SODT

400‐599 kV SODT

600‐799 kV SODT

Out

age

Dur

atio

n (h

r. pe

r Tra

nsfo

rmer

per

yr.)





Element‐Initiated



Figure NERC 2-7 AC/DC BTB Converter Outage Frequency by Outage Initiation Code

0.00

1.00

2.00

3.00

4.00

5.00

6.00

200‐299 kV SOF

200‐299 kV MOF

300‐399 kV SOF

300‐399 kV MOF

No. of O

utages (p

er Con

verter per yr.)





Element‐Initiated

Figure NERC 2-8 AC/DC BTB Converter Outage Duration by Outage Initiation Code

0.0

2.0

4.0

6.0

8.0

10.0

12.0

14.0

16.0

18.0

200‐299 kV SODT

300‐399 kV SODT

Out

age

Dura

tion

(hr.

per C

onve

rter

per y

r.)





Element‐Initiated



2.3 Event Types Event Type data, shown in Table NERC 2-3 below, provides the number and percentage of Events by Event Type as well as the number of outages associated with each Event. See the Event Type 10, 20, 30, 40, and 50 descriptions below.

Each Element outage, Sustained and Momentary, is assigned an Event Type. An Event may contain any number of Sustained and/or Momentary Outages and may include an outage from any type of Element; i.e. AC Circuit, DC Circuit, Transformer, or AC/DC BTB Converter. However, as defined, Event Types 10 and 20 involve only one Element outage, with Event Type 10 involving only an AC Circuit or a Transformer, and Event Type 20 involving a DC Circuit. Event Types 30 and 40 involve two AC Circuit and DC Circuit outages, respectively. Event Type 50 includes all other single or multiple outages not included elsewhere.

The Event Type data below has none of the confidential data exclusions described in Section 1.5. There are two reasons that the exclusions were not applied. First, no TO-specific performance data can be discerned. Second, because Event Types data are intended to include outages of more than one Element, it was not possible to delete confidential TO data without distorting the Event Type data.

Table NERC 2-3

Event Type # # Events % # Outages %10 2948 75.5% 2953 68.0%20 106 2.7% 106 2.4%30 88 2.3% 201 4.6%40 2 0.1% 4 0.1%50 761 19.5% 1080 24.9%

TOTAL 3905 100.0% 4344 100.0%

Event Type # and OutagesEvents Outages

Event Type1020304050

Automatic Outage of two ADJACENT DC Circuits on the common structures with Normal Clearing.Other

Automatic Outage of a DC Circuit with Normal Clearing.

DescriptionAutomatic Outage of an AC Circuit or Transformer with Normal Clearing.

Automatic Outage of two ADJACENT AC Circuits on common structures with Normal Clearing.

NERC Metrics and Data Details


33 NNEERRCC MMeettrriiccss aanndd DDaattaa DDeettaaiillss 3.1 AC Circuit Metrics and Data AC Circuit metrics are displayed in three sections: Section 3.1.1 addresses Sustained Outages and Section 3.1.2 addresses Momentary Outages. In all cases, the metrics displayed in these two sections include all AC Circuits (Overhead and Underground). Additionally, Section 3.1.3 has AC Circuit metrics that are differentiated into Overhead and Underground categories. Data and metrics are displayed for the four AC Voltage Classes in the NERC template plus the total of all Voltages Classes.

3.1.1 AC Circuit Sustained Outages 3.1.1.1 AC Circuit Sustained Outage Initiation Code Metrics

The Outage Initiation Code describes where an outage was initiated.

• Table NERC 3.1-1 on the next page shows metrics for AC Circuit Sustained Outages that were “Element-Initiated,” which means the outages were initiated on or within the Element (AC Circuit in this case) being reported. Since these types of failures are directly linked to circuit exposure measured in Circuit Miles, this table provides a frequency calculation on a per 100 Circuit Miles (CM) basis.

• Table NERC 3.1-2 on the next page shows the metrics for AC Circuit Sustained Outages that were initiated by all other Outage Initiation Codes except those that were Element-Initiated. These included outages that were initiated on or within an AC Substation, an AC/DC Terminal, another TADS Element (Other Element-Initiated), or by other facilities (Other Facility-Initiated).



Table NERC 3.1-1

Voltage Circuit No. of No. of Total Outage Frequency (SCOF) Frequency (SOF) MTTR or Mean Class Miles Circuits Outages Time (hr) (per 100 CM per yr) (per circuit per yr) Outage Duration (hr)

200‐299 kV 103558 4477.5 876 14789.6 0.8459 0.1956 16.9300‐399 kV 56791 1623.6 394 19766.8 0.6938 0.2427 50.2400‐599 kV 32184 594.7 141 3957.9 0.4381 0.2371 28.1600‐799 kV 9451 110.0 28 342.4 0.2963 0.2545 12.2All Voltages 201985 6805.8 1439 38856.7 0.7124 0.2114 27.0

AC Circuit Sustained Outage Metrics - "Element-Initiated" Only

Table NERC 3.1-2

Voltage No. of No. of Total Outage Frequency (SOF) MTTR or Mean Class Circuits Outages Time (hr) (per circuit per yr) Outage Duration (hr)

200‐299 kV 4477.5 509 13973.5 0.1137 27.5300‐399 kV 1623.6 260 39696.9 0.1601 152.7400‐599 kV 594.7 121 5101.5 0.2035 42.2600‐799 kV 110.0 25 99.5 0.2273 4.0All Voltages 6805.8 915 58871.4 0.1344 64.3

AC Circuit Sustained Outage Metrics - Other than "Element-Initiated"



3.1.1.2 AC Circuit Sustained Outage Cause Code Data For Sustained Outages, TADS requests two Cause Codes – an Initiating Cause Code that describes the initiating cause and a Sustained Cause Code that describes the cause that contributes to the longest duration. Table NERC 3.1-3 shows the two Outage Cause Codes (Initiating and Sustained) plus the number of outage hours associated with each Cause Code.

Table NERC 3.1-3 (p. 1 of 3)

No. Init. Init. % No. Sust. Sust. % No. Hrs. Hours % No. Init. Init. % No. Sust. Sust. % No. Hrs. Hours %Weather, excluding lightning

210 15.2% 139 10.0% 2426.9 8.4% 135 20.6% 104 15.9% 13878.6 23.3%

Lightning 203 14.7% 111 8.0% 301.3 1.0% 67 10.2% 54 8.3% 205.0 0.3%Environmental 4 0.3% 8 0.6% 695.8 2.4% 0 0.0% 0 0.0% 0.0 0.0%Contamination 19 1.4% 19 1.4% 115.5 0.4% 6 0.9% 7 1.1% 34.9 0.1%Foreign Interference 87 6.3% 71 5.1% 410.0 1.4% 15 2.3% 11 1.7% 379.6 0.6%

Fire 63 4.5% 43 3.1% 2239.3 7.8% 14 2.1% 13 2.0% 190.6 0.3%Vandalism, Terrorism, or Malicious Acts

3 0.2% 4 0.3% 22.1 0.1% 1 0.2% 0 0.0% 0.0 0.0%

Failed AC Substation Equipment

156 11.3% 178 12.9% 12340.4 42.9% 60 9.2% 76 11.6% 1763.6 3.0%

Failed AC/DC Terminal Equipment

0 0.0% 0 0.0% 0.0 0.0% 0 0.0% 0 0.0% 0.0 0.0%

Failed Protection System Equipment

84 6.1% 98 7.1% 458.4 1.6% 46 7.0% 49 7.5% 257.8 0.4%

Failed AC Circuit Equipment

143 10.3% 178 12.9% 7248.3 25.2% 50 7.6% 62 9.5% 4743.0 8.0%

Failed DC Circuit Equipment

0 0.0% 0 0.0% 0.0 0.0% 0 0.0% 0 0.0% 0.0 0.0%

Vegetation 20 1.4% 19 1.4% 170.2 0.6% 3 0.5% 2 0.3% 20.7 0.0%Power System Condition

73 5.3% 95 6.9% 472.9 1.6% 7 1.1% 18 2.8% 101.0 0.2%

Human Error 125 9.0% 116 8.4% 114.5 0.4% 79 12.1% 71 10.9% 338.9 0.6%Unknown 136 9.8% 199 14.4% 966.4 3.4% 111 17.0% 122 18.7% 1298.1 2.2%Other 59 4.3% 107 7.7% 781.2 2.7% 60 9.2% 65 9.9% 36252.1 61.0%TOTAL 1385 100.0% 1385 100.0% 28763.1 100.0% 654 100.0% 654 100.0% 59463.7 100.0%

AC Circuit Sustained Outages by Cause Code

Outage Cause Code 200‐299 kV 300‐399 kV




No. Init. Init. % No. Sust. Sust. % No. Hrs. Hours % No. Init. Init. % No. Sust. Sust. % No. Hrs. Hours %Weather, excluding lightning

33 12.6% 29 11.1% 2760.1 30.5% 11 20.8% 9 17.0% 176.0 39.8%

Lightning 29 11.1% 14 5.3% 67.8 0.7% 8 15.1% 8 15.1% 13.7 3.1%Environmental 1 0.4% 0 0.0% 0.0 0.0% 0 0.0% 0 0.0% 0.0 0.0%Contamination 11 4.2% 10 3.8% 123.5 1.4% 0 0.0% 0 0.0% 0.0 0.0%Foreign Interference 14 5.3% 10 3.8% 5.8 0.1% 0 0.0% 0 0.0% 0.0 0.0%

Fire 7 2.7% 1 0.4% 0.1 0.0% 4 7.5% 4 7.5% 0.5 0.1%Vandalism, Terrorism, or Malicious Acts

0 0.0% 0 0.0% 0.0 0.0% 0 0.0% 0 0.0% 0.0 0.0%


36 13.7% 36 13.7% 3837.7 42.4% 6 11.3% 4 7.5% 81.7 18.5%


0 0.0% 0 0.0% 0.0 0.0% 0 0.0% 0 0.0% 0.0 0.0%


24 9.2% 26 9.9% 77.0 0.8% 4 7.5% 4 7.5% 21.9 5.0%


17 6.5% 28 10.7% 347.6 3.8% 1 1.9% 2 3.8% 63.7 14.4%


0 0.0% 0 0.0% 0.0 0.0% 0 0.0% 0 0.0% 0.0 0.0%

Vegetation 0 0.0% 0 0.0% 0.0 0.0% 1 1.9% 1 1.9% 8.8 2.0%Power System Condition

19 7.3% 24 9.2% 86.0 0.9% 1 1.9% 3 5.7% 63.0 14.3%

Human Error 35 13.4% 33 12.6% 928.3 10.2% 6 11.3% 14 26.4% 8.8 2.0%Unknown 32 12.2% 48 18.3% 725.5 8.0% 1 1.9% 2 3.8% 2.1 0.5%Other 4 1.5% 3 1.1% 100.2 1.1% 10 18.9% 2 3.8% 1.6 0.4%TOTAL 262 100.0% 262 100.0% 9059.4 100.0% 53 100.0% 53 100.0% 441.9 100.0%


400‐599 kVOutage Cause Code 600‐799 kV




No. Init. Init. % No. Sust. Sust. % No. Hrs. Hours %Weather, excluding lightning

389 16.5% 281 11.9% 19241.6 19.7%

Lightning 307 13.0% 187 7.9% 587.8 0.6%Environmental 5 0.2% 8 0.3% 695.8 0.7%Contamination 36 1.5% 36 1.5% 273.9 0.3%Foreign Interference 116 4.9% 92 3.9% 795.3 0.8%

Fire 88 3.7% 61 2.6% 2430.4 2.5%Vandalism, Terrorism, or Malicious Acts

4 0.2% 4 0.2% 22.1 0.0%


258 11.0% 294 12.5% 18023.4 18.4%


0 0.0% 0 0.0% 0.0 0.0%


158 6.7% 177 7.5% 815.1 0.8%


211 9.0% 270 11.5% 12402.6 12.7%


0 0.0% 0 0.0% 0.0 0.0%

Vegetation 24 1.0% 22 0.9% 199.6 0.2%Power System Condition

100 4.2% 140 5.9% 722.9 0.7%

Human Error 245 10.4% 234 9.9% 1390.4 1.4%Unknown 280 11.9% 371 15.8% 2992.1 3.1%Other 133 5.6% 177 7.5% 37135.1 38.0%TOTAL 2354 100.0% 2354 100.0% 97728.0 100.0%


Outage Cause Code All Voltages

3.1.1.3 Other AC Circuit Sustained Outage Data Table NERC 3.1-4 on the next page shows other AC Circuit Sustained Outage attributes by Fault Type, Outage Initiation Code, Outage Mode Code, Event Type, and Outage Duration Interval.




No. Sust. % No. Hrs. Hours % No. Sust. % No. Hrs. Hours % No. Sust. % No. Hrs. Hours % No. Sust. % No. Hrs. Hours %No fault 408 29.5% 4501.4 15.6% 282 43.1% 39816.9 67.0% 96 36.6% 1916.4 21.2% 31 58.5% 131.5 29.8%P‐P fault 147 10.6% 1537.9 5.3% 31 4.7% 235.4 0.4% 9 3.4% 5.7 0.1% 2 3.8% 0.1 0.0%Single P‐G fault 560 40.4% 16931.1 58.9% 231 35.3% 9014.5 15.2% 116 44.3% 4309.4 47.6% 16 30.2% 169.9 38.5%P‐P‐G, 3 P, or 3P‐G fault

118 8.5% 2892.0 10.1% 20 3.1% 3027.4 5.1% 12 4.6% 2179.2 24.1% 4 7.5% 140.4 31.8%

Unknown fault type 152 11.0% 2900.7 10.1% 90 13.8% 7369.6 12.4% 29 11.1% 648.8 7.2% 0 0.0% 0.0 0.0%TOTAL 1385 100.0% 28763.1 100.0% 654 100.0% 59463.7 100.0% 262 100.0% 9059.4 100.0% 53 100.0% 441.9 100.0%

No. Sust. % No. Hrs. Hours % No. Sust. % No. Hrs. Hours % No. Sust. % No. Hrs. Hours % No. Sust. % No. Hrs. Hours %

Element‐Initiated 876 63.2% 14789.6 51.4% 394 60.2% 19766.8 33.2% 141 53.8% 1916.4 21.2% 31 58.5% 131.5 29.8%Other Element‐Initiated

82 5.9% 329.1 1.1% 46 7.0% 183.3 0.3% 12 4.6% 5.7 0.1% 2 3.8% 0.1 0.0%


262 18.9% 3944.1 13.7% 113 17.3% 39123.6 65.8% 55 21.0% 4309.4 47.6% 16 30.2% 169.9 38.5%


2 0.1% 336.1 1.2% 1 0.2% 0.6 0.0% 0 0.0% 2179.2 24.1% 4 7.5% 140.4 31.8%

Other Facility‐Initiated 163 11.8% 9364.1 32.6% 100 15.3% 389.6 0.7% 54 20.6% 648.8 7.2% 0 0.0% 0.0 0.0%

TOTAL 1385 100.0% 28763.1 100.0% 654 100.0% 59463.7 100.0% 262 100.0% 9059.4 100.0% 53 100.0% 441.9 100.0%

No. Sust. % No. Hrs. Hours % No. Sust. % No. Hrs. Hours % No. Sust. % No. Hrs. Hours % No. Sust. % No. Hrs. Hours %Single Mode 999 72.1% 24406.3 84.9% 447 68.3% 19766.8 33.2% 209 79.8% 8369.1 92.4% 28 52.8% 342.4 77.5%Dependent Mode Initiating

60 4.3% 842.7 2.9% 65 9.9% 183.3 0.3% 5 1.9% 56.8 0.6% 0 0.0% 0.0 0.0%

Dependent Mode 163 11.8% 753.2 2.6% 75 11.5% 39123.6 65.8% 14 5.3% 25.4 0.3% 4 7.5% 59.5 13.5%Common Mode 149 10.8% 2598.5 9.0% 58 8.9% 0.6 0.0% 30 11.5% 583.5 6.4% 0 0.0% 0.0 0.0%Common Mode Initiating

14 1.0% 162.5 0.6% 9 1.4% 389.6 0.7% 4 1.5% 24.8 0.3% 21 39.6% 40.0 9.0%

TOTAL 1385 100.0% 28763.1 100.0% 654 100.0% 59463.7 100.0% 262 100.0% 9059.4 100.0% 53 100.0% 441.9 100.0%

400‐599 kV200‐299 kV 300‐399 kV

600‐799 kV

Outage Mode Code 600‐799 kV

Outage Initiation Code

200‐299 kV 300‐399 kV 400‐599 kV

AC Circuit - Other Sustained Outage Attributes 600‐799 kV400‐599 kV

Fault Type200‐299 kV 300‐399 kV




No. Sust. % No. Sust. % No. Sust. % No. Sust. %1‐5 Minutes 377 27.2% 165 25.2% 83 31.7% 10 18.9%6‐10 Minutes 135 9.7% 49 7.5% 27 10.3% 4 7.5%11‐30 Minutes 143 10.3% 71 10.9% 39 14.9% 8 15.1%31‐120 Minutes 176 12.7% 87 13.3% 30 11.5% 11 20.8%121 Minutes to 24 Hours 432 31.2% 199 30.4% 45 17.2% 15 28.3%> 24 Hours to 48 Hours 54 3.9% 36 5.5% 12 4.6% 2 3.8%> 48 Hours 68 4.9% 47 7.2% 26 9.9% 3 5.7%TOTAL 1385 100.0% 654 100.0% 262 100.0% 53 100.0%

Outage Duration Interval

200‐299 kV 300‐399 kV 400‐599 kV 600‐799 kV

NERC Metrics and Data Detail



No. Sust. % No. Hrs. Hours %No fault 817 34.7% 46366.1 47.4%P‐P fault 189 8.0% 1779.1 1.8%Single P‐G fault 923 39.2% 30424.8 31.1%P‐P‐G, 3 P, or 3P‐G fault 154 6.5% 8239.0 8.4%Unknown fault type 271 11.5% 10919.1 11.2%TOTAL 2354 100.0% 97728.0 100.0%

No. Sust. % No. Hrs. Hours %Element‐Initiated 1442 61.3% 36604.2 37.5%Other Element‐Initiated 142 6.0% 518.2 0.5%AC Substation‐Initiated 446 18.9% 47547.0 48.7%AC/DC Terminal‐Initiated 7 0.3% 2656.3 2.7%Other Facility‐Initiated 317 13.5% 10402.4 10.6%TOTAL 2354 100.0% 97728.0 100.0%

No. Sust. % No. Hrs. Hours %Single Mode 1683 71.5% 52884.5 54.1%Dependent Mode Initiating 130 5.5% 1082.8 1.1%Dependent Mode 256 10.9% 39961.6 40.9%Common Mode 237 10.1% 3182.5 3.3%Common Mode Initiating 48 2.0% 616.7 0.6%TOTAL 2354 100.0% 97728.0 100.0%

No. Sust. % No. Hrs. Hours %10 1541 65.5% 38172.6 39.1%30 153 6.5% 6552.8 6.7%50 660 28.0% 53002.6 54.2%

TOTAL 2354 100.0% 97728.0 100.0%

No. Sust. %1‐5 Minutes 635 27.0%6‐10 Minutes 215 9.1%11‐30 Minutes 261 11.1%31‐120 Minutes 304 12.9%121 Minutes to 24 Hours 691 29.4%> 24 Hours to 48 Hours 104 4.4%> 48 Hours 144 6.1%TOTAL 2354 100.0%

AC Circuit - Other Sustained Outage Attributes All Voltages

All Voltages

All Voltages

Fault Type

All VoltagesEvent Type #



All Voltages

Outage Mode Code



3.1.2 AC Circuit Momentary Outages 3.1.2.1 AC Circuit Momentary Outage Initiation Code Metrics

The Outage Initiation Code describes where an outage was initiated.

• Table NERC 3.1-5 shows metrics for AC Circuit Momentary Outages that were “Element-Initiated,” which means the outages were initiated on or within the Element (AC Circuit in this case) being reported. Since these types of failures are directly linked to circuit exposure measured in Circuit Miles, this table provides a frequency calculation on a per 100 Circuit Miles (CM) basis.

• Table NERC 3.1-6 shows the metrics for AC Circuit Momentary Outages that were initiated by all other Outage Initiation Codes except those that were Element-Initiated. These included outages that were initiated on or within an AC Substation, an AC/DC Terminal, another TADS Element (Other Element-Initiated), or by other facilities (Other Facility-Initiated).

Table NERC 3.1-5

Voltage Circuit No. of No. of Frequency (MCOF) Frequency (MOF) Class Miles Circuits Outages (per 100 CM per yr) (per circuit per yr)

200‐299 kV 103558 4477.5 661 0.6383 0.1476300‐399 kV 56791 1623.6 519 0.9139 0.3197400‐599 kV 32184 594.7 125 0.3884 0.2102600‐799 kV 9451 110.0 32 0.3386 0.2909All Voltages 201985 6805.8 1337 0.6619 0.1965

AC Circuit Momentary Outage Metrics - "Element-Initiated" Only

Table NERC 3.1-6

Voltage No. of No. of Frequency (MOF) Class Circuits Outages (per circuit per yr)

200‐299 kV 4477.5 223 0.0498300‐399 kV 1623.6 73 0.0450400‐599 kV 594.7 38 0.0639600‐799 kV 110.0 5 0.0455All Voltages 6805.8 339 0.0498

AC Circuit Momentary Outage Metrics - Other than "Element-Initiated"

3.1.2.2 AC Circuit Momentary Outage Cause Code Data For Momentary Outages, TADS requests one Cause Code: an Initiating Cause Code. Table NERC 3.1-7 reports Cause Code data for AC Circuit Momentary Outages.



Table NERC 3.1-7

No. Mom. % No. Mom. % No. Mom. % No. Mom. % No. Mom. %Weather, excluding lightning

88 10.0% 83 14.0% 10 6.1% 12 32.4% 193 11.5%

Lightning 290 32.8% 162 27.4% 58 35.6% 10 27.0% 520 31.0%Environmental 0 0.0% 1 0.2% 0 0.0% 0 0.0% 1 0.1%Contamination 19 2.1% 34 5.7% 8 4.9% 0 0.0% 61 3.6%Foreign Interference 65 7.4% 18 3.0% 5 3.1% 1 2.7% 89 5.3%

Fire 15 1.7% 5 0.8% 1 0.6% 2 5.4% 23 1.4%Vandalism, Terrorism, or Malicious Acts

0 0.0% 0 0.0% 0 0.0% 0 0.0% 0 0.0%


25 2.8% 20 3.4% 1 0.6% 3 8.1% 49 2.9%


0 0.0% 0 0.0% 0 0.0% 0 0.0% 0 0.0%


65 7.4% 28 4.7% 9 5.5% 0 0.0% 102 6.1%


37 4.2% 21 3.5% 9 5.5% 0 0.0% 67 4.0%


0 0.0% 0 0.0% 0 0.0% 0 0.0% 0 0.0%

Vegetation 4 0.5% 2 0.3% 0 0.0% 0 0.0% 6 0.4%Power System Condition

48 5.4% 0 0.0% 0 0.0% 0 0.0% 48 2.9%

Human Error 56 6.3% 12 2.0% 6 3.7% 2 5.4% 76 4.5%Unknown 157 17.8% 189 31.9% 56 34.4% 6 16.2% 408 24.3%Other 15 1.7% 17 2.9% 0 0.0% 1 2.7% 33 2.0%TOTAL 884 100.0% 592 100.0% 163 100.0% 37 100.0% 1676 100.0%

All Voltages

AC Circuit Momentary Outages by Cause Code

Outage Cause Code 600‐799 kV200‐299 kV 300‐399 kV 400‐599 kV

3.1.2.3 Other AC Circuit Momentary Outage Data

Table NERC 3.1-8 on the next page shows other AC Circuit Momentary Outage attributes by Fault Type, Outage Initiation Code, Outage Mode Code, and Event Type.



Table NERC 3.1-8

No. Mom. % No. Mom. % No. Mom. % No. Mom. % No. Mom. %No fault 177 20.0% 174 29.4% 13 8.0% 22 59.5% 386 23.0%P‐P fault 36 4.1% 9 1.5% 1 0.6% 0 0.0% 46 2.7%Single P‐G fault 523 59.2% 327 55.2% 124 76.1% 15 40.5% 989 59.0%P‐P‐G, 3 P, or 3P‐G fault

70 7.9% 8 1.4% 8 4.9% 0 0.0% 86 5.1%

Unknown fault type 78 8.8% 74 12.5% 17 10.4% 0 0.0% 169 10.1%TOTAL 884 100.0% 592 100.0% 163 100.0% 37 100.0% 1676 100.0%

No. Mom. % No. Mom. % No. Mom. % No. Mom. % No. Mom. %

Element‐Initiated 661 74.8% 519 87.7% 125 76.7% 32 86.5% 1337 79.8%Other Element‐Initiated

29 3.3% 16 2.7% 5 3.1% 1 2.7% 51 3.0%


115 13.0% 29 4.9% 20 12.3% 3 8.1% 167 10.0%


0 0.0% 0 0.0% 0 0.0% 0 0.0% 0 0.0%

Other Facility‐Initiated 79 8.9% 28 4.7% 13 8.0% 1 2.7% 121 7.2%

TOTAL 884 100.0% 592 100.0% 163 100.0% 37 100.0% 1676 100.0%

No. Mom. % No. Mom. % No. Mom. % No. Mom. % No. Mom. %

Single Mode 696 78.7% 414 69.9% 152 93.3% 13 35.1% 1275 76.1%Dependent Mode Initiating

25 2.8% 124 20.9% 4 2.5% 22 59.5% 175 10.4%

Dependent Mode 95 10.7% 24 4.1% 4 2.5% 1 2.7% 124 7.4%Common Mode 65 7.4% 27 4.6% 3 1.8% 0 0.0% 95 5.7%Common Mode Initiating

3 0.3% 3 0.5% 0 0.0% 1 2.7% 7 0.4%

TOTAL 884 100.0% 592 100.0% 163 100.0% 37 100.0% 1676 100.0%

No. Mom. 0 No. Mom. 0 No. Mom. 0 No. Mom. % No. Mom. %10 706 79.9% 501 84.6% 146 89.6% 28 75.7% 1381 82.4%30 39 4.4% 5 0.8% 3 1.8% 0 0.0% 47 2.8%50 139 15.7% 86 14.5% 14 8.6% 9 24.3% 248 14.8%

TOTAL 884 100.0% 592 100.0% 163 100.0% 37 100.0% 1676 100.0%

All Voltages

All Voltages

All Voltages

All Voltages600‐799 kV400‐599 kV

600‐799 kV400‐599 kV

AC Circuit - Other Momentary Outage Attributes

400‐599 kV


200‐299 kV 300‐399 kV

200‐299 kV 300‐399 kV

Event Type #200‐299 kV

Outage Mode Code200‐299 kV

Fault Type

600‐799 kV400‐599 kV

600‐799 kV

300‐399 kV

300‐399 kV

3.1.3 Total AC Circuit Metrics Table NERC 3.1-9 on the next page displays AC Circuit metrics that are defined in Appendix 2.



Table NERC 3.1-9

MTTR MTTR MTTR

Voltage Class OH/UG TOF SOF MOF P(5%) < MTTR 50/50 P(5%) > APC % PCZO % PCDR %

200‐299 kV Overhead 0.52 0.31 0.20 6.39 20.34 20.34 20.34 0.68 27859.21 99.92 69.23 2.27300‐399 kV Overhead 0.79 0.41 0.38 37.79 92.51 92.51 92.52 0.93 21355.0 99.57 62.07 1.14400‐599 kV Overhead 0.72 0.44 0.28 15.28 34.57 34.58 34.58 0.32 19782.2 99.82 66.67 1.18600‐799 kV Overhead 0.82 0.48 0.34 4.02 8.32 8.34 8.35 0.88 18172.8 99.95 53.64 0.00200‐299 kV Underground 0.18 0.12 0.05 7.71 60.71 62.79 64.87 1.72 71268.64 99.91 87.61 0.00300‐399 kV Underground 0.28 0.27 0.02 8.31 30.66 31.29 31.93 6.95 32947.5 99.91 78.13 0.00400‐599 kV Underground C C C C C C C C C C C C

TCOF TCOF SCOF SCOF MCOF MCOF

Voltage Class OH/UG All Elemt. Init. All Elemt. Init. All Elemt. Init. TMCOF SMCOF MMCOFMomentary Outages

Sustained Outages

Sustained Outages Hours

200‐299 kV Overhead 2.18 1.49 1.33 0.85 0.85 0.64 0.53 0.42 0.13 878 1371 27884.1300‐399 kV Overhead 2.18 1.62 1.13 0.70 1.05 0.92 0.23 0.22 0.05 591 637 58931.7400‐599 kV Overhead 1.32 0.83 0.82 0.44 0.51 0.39 0.15 0.05 0.10 163 262 9059.4600‐799 kV Overhead 0.95 0.63 0.56 0.30 0.39 0.34 ‐ ‐ ‐ 37 53 441.9

Mixed Voltages Overhead 0.00 0.00 0.00200‐299 kV Underground 3.86 0.96 2.70 0.96 1.16 0.00 6 14 879.0300‐399 kV Underground 3.97 0.22 3.75 0.22 0.22 0.00 1 17 532.0400‐599 kV Underground C C C C C C C C C

TOTAL 1676 2354 97728.0

Element Availability (8‐10)

AC Circuit Metrics 1-16 per Appendix 2

Multiple Circuit Outage Frequency (14‐16)

Outage Totals

Element Outage Duration, Repair Time, and Update Time (4‐7)

Circuit Outage Frequency (11‐13)

Element Outage Frequency (1‐3)MdTTR MTBFSODT



3.2 DC Circuit Metrics and Data DC Circuit metrics are displayed in three sections: Section 3.2.1 addresses Sustained Outages and Section 3.2.2 addresses Momentary Outages. In all cases, the metrics displayed in these two sections include all DC Circuits (Overhead and Underground). Additionally, Section 3.1.3 has DC Circuit metrics that are differentiated into Overhead and Underground categories. Data and metrics are displayed for the three DC Circuit Voltage Classes in the NERC template plus the total of all Voltage Classes.

3.2.1 DC Circuit Sustained Outages 3.2.1.1 DC Circuit Sustained Outage Initiation Code Metrics

The Outage Initiation Code describes where an outage initiated.

• Table NERC 3.2-1 on the next page shows metrics for DC Circuit Sustained Outages that were “Element-Initiated,” which means the outages were initiated on or within the Element (DC Circuit in this case) being reported. Since these types of failures are directly linked to circuit exposure measured in Circuit Miles, this table provides a frequency calculation on a per 100 Circuit Miles (CM) basis.

• Table NERC 3.2-2 on the next page shows the metrics for DC Circuit Sustained Outages that were initiated by all other Outage Initiation Codes except those that were Element-Initiated. These included outages that were initiated on or within an AC Substation, an AC/DC Terminal, another TADS Element (Other Element-Initiated), or by other facilities (Other Facility-Initiated).



Table NERC 3.2-1

Table NERC 3.2-2



3.2.1.2 DC Circuit Sustained Outage Cause Code Data For Sustained Outages, TADS requests two Cause Codes – an Initiating Cause Code that describes the initiating cause and a Sustained Cause Code that describes the cause that contributes to the longest duration. Table NERC 3.2-3 shows the two Outage Cause Codes (Initiating and Sustained) plus the number of outage hours associated with each Cause Code.





3.2.1.3 Other DC Circuit Sustained Outage Data Table NERC 3.2-4 on the next page shows other DC Circuit Sustained Outage attributes by Fault Type, Outage Initiation Code, Outage Mode Code, Event Type, and Outage Duration Interval.







No. Sust. % No. Sust. % No. Sust. % No. Sust. %

1‐5 Minutes C C 0 0.0% 1 4.3% 1 3.2%6‐10 Minutes C C 0 0.0% 1 4.3% 1 3.2%11‐30 Minutes C C 0 0.0% 8 34.8% 8 25.8%31‐120 Minutes C C 4 50.0% 7 30.4% 11 35.5%121 Minutes to 24 Hours C C 4 50.0% 5 21.7% 9 29.0%> 24 Hours to 48 Hours C C 0 0.0% 0 0.0% 0 0.0%> 48 Hours C C 0 0.0% 1 4.3% 1 3.2%TOTAL C C 8 100.0% 23 100.0% 31 100.0%

DC Circuit - Sustained Outage Duration Intervals


200‐299 kV All Voltages500‐599 kV400‐499 kV



3.2.2 DC Circuit Momentary Outages 3.2.2.1 DC Circuit Momentary Outage Initiation Code Metrics


• Table NERC 3.2-5 shows metrics for DC Circuit Momentary Outages that were “Element-Initiated,” which means the outages were initiated on or within the Element (DC Circuit in this case) being reported. Since these types of failures are directly linked to circuit exposure measured in Circuit Miles, this table provides a frequency calculation on a per 100 Circuit Miles (CM) basis.

• Table NERC 3.2-6 shows the metrics for DC Circuit Momentary Outages that were initiated by all other Outage Initiation Codes except those that were Element-Initiated. These included outages that were initiated on or within an AC Substation, an AC/DC Terminal, another TADS Element (Other-Element Initiated), or by other facilities (Other Facility-Initiated).

Table NERC 3.2-5

Table NERC 3.2-6



3.2.2.2 DC Circuit Momentary Outage Cause Code Data For Momentary Outages, TADS requests one Cause Code: an Initiating Cause Code. Table NERC 3.2-7 reports Cause Code data for DC Circuit Momentary Outages.

Table NERC 3.2-7

3.2.2.3 Other DC Circuit Momentary Outage Data Table NERC 3.2-8 on the next page shows other DC Circuit Momentary Outage attributes by Fault Type, Outage Initiation Code, Outage Mode Code, and Event Type.



Table NERC 3.2-8

3.2.3 Total DC Circuit Metrics Table NERC 3.2-9 on the next page displays DC Circuit metrics that are defined in Appendix 2.



Table NERC 3.2-9



3.3 Transformer Metrics and Data Transformer metrics are displayed in three sections: Section 3.3.1 addresses Sustained Outages, Section 3.3.2 addresses Momentary Outages, and Section 3.3.3 has Transformer metrics per the formulas in Appendix 2. Data and metrics are displayed for all four Transformer Voltages Classes in the NERC template plus the total of all Voltage Classes.

3.3.1 Transformer Sustained Outages 3.3.1.1 Transformer Sustained Outage Initiation Code Metrics


• Table NERC 3.3-1 shows metrics for Transformer Sustained Outages that were “Element-Initiated,” which means the outages were initiated on or within the Element (Transformer in this case) being reported.

• Table NERC 3.3-2 shows the metrics for Transformer Sustained Outages that were initiated by all other Outage Initiation Codes except those that were Element-Initiated. These included outages that were initiated on or within an AC Substation, an AC/DC Terminal, another TADS Element (Other Element-Initiated), or by other facilities (Other Facility-Initiated).

Table NERC 3.3-1

Table NERC 3.3-2



3.3.1.2 Transformer Sustained Outage Cause Code Data For Sustained Outages, TADS requests two Cause Codes – an Initiating Cause Code that describes the initiating cause and a Sustained Cause Code that describes the cause that contributes to the longest duration. Table NERC 3.3-3 shows the two Outage Cause Codes (Initiating and Sustained) plus the number of outage hours associated with each Cause Code.








3.3.1.3 Other Transformer Sustained Outage Data Table NERC 3.3-4 on the next page shows other Transformer Sustained Outage attributes by Fault Type, Outage Initiation Code, Outage Mode Code, Event Type, and Outage Duration Interval.







No. Sust. % No. Sust. % No. Sust. % No. Sust. %1‐5 Minutes 0 0.0% 7 25.0% 7 15.2% 0 0.0%6‐10 Minutes 0 0.0% 0 0.0% 3 6.5% 1 4.8%11‐30 Minutes 1 20.0% 3 10.7% 4 8.7% 3 14.3%31‐120 Minutes 0 0.0% 5 17.9% 6 13.0% 3 14.3%121 Minutes to 24 Hours 3 60.0% 9 32.1% 11 23.9% 7 33.3%> 24 Hours to 48 Hours 0 0.0% 0 0.0% 4 8.7% 2 9.5%> 48 Hours 1 20.0% 4 14.3% 11 23.9% 5 23.8%TOTAL 5 100.0% 28 100.0% 46 100.0% 21 100.0%

Transformer - Sustained Outage Duration Intervals400‐599 kV 600‐799 kVOutage Duration

Interval200‐299 kV 300‐399 kV






3.3.2 Transformer Momentary Outages 3.3.2.1 Transformer Momentary Outage Initiation Code Metrics


• Table NERC 3.3-5 shows metrics for Transformer Momentary Outages that were “Element-Initiated,” which means the outages were initiated on or within the Element (Transformer in this case) being reported.

• Table NERC 3.3-6 shows the metrics for Transformer Momentary Outages that were initiated by all other Outage Initiation Codes except those that were Element-Initiated. These included outages that were initiated on or within an AC Substation, an AC/DC Terminal, another TADS Element (Other Element-Initiated), or by other facilities (Other Facility-Initiated).

Table NERC 3.3-5

Table NERC 3.3-6

3.3.2.2 Transformer Momentary Outage Cause Code Data

For Momentary Outages, TADS requests one Cause Code: an Initiating Cause Code. Table NERC 3.3-7 on the next page reports Cause Code data for Transformer Momentary Outages.



Table NERC 3.3-7

3.3.2.3 Other Transformer Momentary Outage Data Table NERC 3.3-8 on the next page shows other Transformer Momentary Outage attributes by Fault Type, Outage Initiation Code, Outage Mode Code, and Event Type.



Table NERC 3.3-8

3.3.3 Total Transformer Metrics Table NERC 3.3-9 displays Transformer metrics that are defined in Appendix 2.



Table NERC 3.3-9



3.4 AC/DC BTB Converter Metrics and Data AC/DC BTB Converter metrics are displayed in three sections: Section 3.4.1 addresses Sustained Outages, Section 3.4.2 addresses Momentary Outages, and Section 3.4.3 has AC/DC BTB Converter metrics per the formulas in Appendix 2. Data and metrics are displayed for the two AC/DC BTB Converter Voltages Classes in the NERC template plus the total of all Voltage Classes.

3.4.1 AC/DC BTB Converter Sustained Outages 3.4.1.1 AC/DC BTB Converter Sustained Outage Initiation Code Metrics


• Table NERC 3.4-1 shows metrics for AC/DC BTB Converter Sustained Outages that were “Element-Initiated,” which means the outages were initiated on or within the Element (AC/DC BTB Converter in this case) being reported.

• Table NERC 3.4-2 shows the metrics for AC/DC BTB Converter Sustained Outages that were initiated by all other Outage Initiation Codes except those that were Element-Initiated. These included outages that were initiated on or within an AC Substation, an AC/DC Terminal, another TADS Element (Other Element-Initiated), or by other facilities (Other Facility-Initiated).

Table NERC 3.4-1

Table NERC 3.4-2



3.4.1.2 AC/DC BTB Converter Sustained Outage Cause Code Data For Sustained Outages, TADS requests two Cause Codes – an Initiating Cause Code that describes the initiating cause and a Sustained Cause Code that describes the cause that contributes to the longest duration. Table NERC 3.4-3 shows the two Outage Cause Codes (Initiating and Sustained) plus the number of outage hours associated with each Cause Code.

Table NERC 3.4-3 (p 1 of 2)



Table NERC 3.4-3 (p 2 of 2)

3.4.1.3 Other AC/DC BTB Converter Sustained Outage Data Table NERC 3.4-4 on the next page shows other AC/DC BTB Converter Sustained Outage attributes by Fault Type, Outage Initiation Code, Outage Mode Code, Event Type, and Outage Duration Interval.



Table NERC 3.4-4

Table NERC 3.4-4 (continued on next page)



Table NERC 3.4-4 (continued)



3.4.2 AC/DC BTB Converter Momentary Outages 3.4.2.1 AC/DC BTB Converter Momentary Outage Initiation Code Metrics


• Table NERC 3.4-5 shows metrics for AC/DC BTB Converter Momentary Outages that were “Element-Initiated,” which means the outages were initiated on or within the Element (AC/DC BTB Converter in this case) being reported.

• Table NERC 3.4-6 shows the metrics for AC/DC BTB Converter Momentary Outages that were initiated by all other Outage Initiation Codes except those that were Element-Initiated. These included outages that were initiated on or within an AC Substation, an AC/DC Terminal, another TADS Element (Other Element-Initiated), or by other facilities (Other Facility-Initiated).

Table NERC 3.4-5

Table NERC 3.4-6

3.4.2.2 AC/DC BTB Converter Momentary Outage Cause Code Data For Momentary Outages, TADS requests one Cause Code: an Initiating Cause Code. Table NERC 3.4-7 on the next page reports Cause Code data for AC/DC BTB Converter Momentary Outages.



Table NERC 3.4-7

3.4.2.3 Other AC/DC BTB Converter Momentary Outage Data

Table NERC 3.4-8 shows other AC/DC BTB Converter Momentary Outage attributes by Fault Type, Outage Initiation Code, Outage Mode Code, and Event Type.



Table NERC 3.4-8



3.4.3 Total AC/DC BTB Converter Metrics Table NERC 3.4-9 on the next page displays AC/DC BTB Converter metrics which are defined in Appendix 2.



Table NERC 3.4-9

Appendix 1

Transmission Availability Data System, NERC - 2009 Report Appendix 1-1 June 14, 2010

Appendix 1 TADS Definitions

The definitions are a separate document that may be downloaded at http://www.nerc.com/docs/pc/tadstf/Appendix_1_TADS_2008_Reports_(All).pdf. These definitions were posted on September 11, 2008 for use during calendar year 2009 data collection.

Appendix 2


Appendix 2 Metric Definitions

The TADS Metric definitions are contained on the table below, which is divided into two sections: the first page has metrics 1-10 that apply to all Elements. The second page has metrics 11-16 that only apply to AC Circuits or DC Circuits.

• Metric 5: Mean-time-to-repair (MTTR) has the same meaning as mean outage duration. Since this calculation may be based upon a limited number of outages for smaller Regions or individual Transmission Owner organizations, the computed value is an estimate of the “true” MTTR for the Element. Using statistical methods, one can estimate the uncertainty in the mean calculation. The tables in the main report provide a range of MTTR values:

o The value that is calculated straight from the data is labeled “MTTR 50/50.”

o The MTTR labeled “P(5%) >” means the true MTTR has a 5 % chance of being greater than this value, and the MTTR labeled “P(5%)<” means the true MTTR has a 5% chance of being lower than this value

When a fairly large number of outages are used to calculate the MTTR 50/50 value, the range of uncertainty is fairly low. See the Overhead AC Circuit MTTR values on NERC 3.1-9. When only a few outages are used, the range is very large, indicating a high degree of uncertainty between the calculated MTTR and the “true” MTTR.

• Metrics 11, 12, and 13: Circuit outage frequency on a per 100 Circuit Mile basis - Total Circuit Outage Frequency (TCOF), Sustained Circuit Outage Frequency (SCOF), and Momentary Circuit Outage Frequency (MCOF), are calculated twice – one calculation includes all outages while a second calculation only includes Element-Initiated outages. The second calculation more correctly relates outages initiated on the circuit (the Element in this case) to total circuit exposure measured by mileage.

Appendix 2


No. Metric Formula Units Acronym

1 Element Total Automatic Outage Frequency

Total Automatic Outages / Total Elements No. Automatic Outages per Element per year

TOF

2 Element Sustained Outage Frequency Total Sustained Outages / Total Elements No. Sustained Outages per Element per year

SOF

3 Element Momentary Outage Frequency Total Momentary Outages / Total Elements No. Momentary Outages per Element per year

MOF

4 Element Sustained Outage Duration Time Total Sustained Outage Hours / Total Elements No. Sustained Outages hours per Element per year

SODT

5 Element Sustained Outage Mean Time to Repair. Also referred to as Mean Outage Duration

Total Sustained Outage Hours / Total Sustained Element Outages

Average no. of Sustained Outage Hours per outaged Element

MTTR

6 Median Time to Repair Sustained Element Outage Failures

The time when 50% of the Sustained Outage Duration hours per outaged Element are greater than this figure

Median no. of Sustained Outage Hours per outaged Element

MdTTR

7 Mean Time Between Sustained Element Outages (Mean "Up Time"). Also referred to as Mean Time Between Failures.

(Total Element Hours - Total Sustained Outage Hours) / Total Sustained Element Outages

Mean (average) no. of hours of operation of an Element before it fails

MTBF1

8 Element Availability Percentage 1- (Total Sustained Outage Hours / Total Element Hours) * 100

Percentage APC1

9 Percentage of Elements with Zero Automatic Outages

Total Elements with Zero Automatic Outages / Total Elements

Percentage PCZO

10 Percent of Element Automatic Outages associated with a Disturbance Report (EOP-004)

Total Automatic Outages associated with a Disturbance Report / Total Automatic Outages

Percentage PCDR

Element Availability

Element Outage Frequency

Element Outage Duration, Repair Time, and Up Time

1 Since Non-Automatic Outage data are not collected, these metrics will be overstated from industry definitions.

Appendix 2


Metric Formula Units Acronym

11 Circuit Total Outage Frequency, Mileage Adjusted

(Total Circuit Automatic Outages *100) / Total Circuits Miles

No. Automatic Outages per 100 Circuit Miles per year

TCOF100CM

12 Circuit Sustained Outage Frequency, Mileage Adjusted

(Total Circuit Sustained Outages *100) / Total Circuit Miles

No. Sustained Outages per 100 Circuit Miles per year

SCOF100CM

13 Circuit Momentary Outage Frequency, Mileage Adjusted

(Total Circuit Momentary Outages *100) / Total Circuit Miles

No. Momentary Outages per 100 Circuit Miles per year

MCOF100CM

14 Multi Circuit Total Outage Frequency, Mileage Adjusted

(Total Multi-Circuit Automatic Outages *100) / Total Multi-Circuit Structure Miles

No. Automatic Outages per 100 Multi-Circuit Structures Miles per year

TMCOF100SM

15 Multi-Circuit Sustained Outage Frequency, Mileage Adjusted

(Total Multi-Circuit Sustained Outages *100) / Total Multi-Circuit Structure Miles

No. Sustained Outages per 100 Multi-Circuit Structure Miles per year

SMCOF100SM

16 Multi-Circuit Momentary Outage Frequency, Mileage Adjusted

(Total Multi-Circuit Momentary Outages *100) / Total Multi-Circuit Structure Miles

No. Momentary Outages per 100 Multi-Circuit Structure Mles per year

MMCOF100SM

Circuit Outage Frequency, per 100 Circuit Miles (Applies to AC and DC Circuits Only)

Multiple Circuit Outage Frequency per 100 Multi-Circuit Structure Miles (For AC Circuits, multi circuit outages are Event Type 30 outages; for DC Circuits, they are Event Type 40 outages.)

Appendix 3

Transmission Availability Data System, NERC - 2009 Report Appendix 3 June 14, 2010

Appendix 3 TADS Working Group Members as of April 23, 2010

Chair and TO-TRE Member

Michael J. Pakeltis, P.E. Manager, Reliability Analysis & Technical Support, Transmission Operations

CenterPoint Energy P.O. Box 1700 Houston, Texas 77251-1700

(713) 207-6714 (713) 207-9122 Fx michael.pakeltis@ centerpointenergy.com

Vice Chair and TO-NPCC Member

Julian Cox, C.Eng. Director, Operational Planning and Review

National Grid 40 Sylvan Road Waltham, Massachusetts 02451

(781) 907-2399 (781)907-5707 Fx julian.cox@ us.ngrid.com

Secretary Ronald J. Niebo

Reliability Assessment Coordinator

North American Electric Reliability Corporation 116-390 Village Boulevard Princeton, New Jersey 08540-5721

(609) 452-8060 (609) 452-9550 Fx ron.niebo@ nerc.net

RE Member Adam Flink

Engineer Midwest Reliability Organization 2774 Cleveland Ave Roseville, Minnesota 55113

(651) 855-1705 (651) 855-1712 Fx ad.flink@ midwestreliability.org

RE Member Rao Somayajula, P.E.

Senior Engineer ReliabilityFirst Corporation 320 Springside Drive Suite 300 Akron, Ohio 44333

(330) 247-3061 (330) 456-3648 Fx rao.somayajula@ rfirst.org

TO-RFC Member

Steven J. Hedden Principal Engineer

Commonwealth Edison Co. 1N301 Swift Road Lombard, Illinois 60148

(630) 691-4594 (630) 691-4414 Fx steven.hedden@ comed.com

TO-WECC Member

Brian K. Keel Manager, Transmission System Planning

Salt River Project MS POB100 PO Box 52025 Phoenix, Arizona 85072

602-236-0970 (602) 236-3896 Fx brian.keel@ srpnet.com

TO-SPP Member

Jake Langthorn, P.E. Transmission Tariff Coordinator

Oklahoma Gas and Electric Co. 320 N Harvey Oklahoma City, Oklahoma 73101

405-553-3409 (405) 553-3165 Fx [email protected]

TO-SERC member

Ronald Carlsen System Security Manager

Georgia Power Company 241 Ralph McGill Blvd NE Bin 10024 Atlanta, Georgia 30308

(404) 506-2958 (404) 506-1240 Fx rlcarlse@ southernco.com

TO-FRCC Member

G. Brantley Tillis, P.E. Manager, Transmission Planning Florida

Progress Energy Florida 3300 Exchange Place Lake Mary, Florida 32746

407-942-9569 407-942-9797 Fx brantley.tillis@ pgnmail.com

Appendix 3

Transmission Availability Data System, NERC - 2009 Report Appendix 3 June 14, 2010

TO-MRO Member

Kurt Weisman Reliability Performance Project Manager

American Transmission Company W234 N2000 Ridgeview Pkwy. Ct. Waukesha, Wisconsin 53187-0047

(262) 506-6920 (262) 832-8650 Fx kweisman@ atcllc.com

At-Large Member

Michael S. Clemons, P.E. System Engineer

Tennessee Valley Authority 1101 Market Street Mailstop: MR-5K-C Chattanooga, Tennessee 37402

423-751-7098 423-751-4442 Fx msclemons@ tva.gov

At-Large Member

Jeff Schaller Performance Manager

Hydro One Networks, Inc. 483 Bay Street TCT14 Toronto, Ontario M5G 2P5

(416) 345-5268 (416) 345-5401 Fx jeff.schaller@ HydroOne.com

NERC Staff Jim K. Robinson, P.E.

TADS Manager North American Electric Reliability Corporation 116-390 Village Boulevard Princeton, New Jersey 08540-5721

(610) 841-3362 jim.robinson@ nerc.net

Mark G. Lauby

Director of Reliability Assessment and Performance Analysis

North American Electric Reliability Corporation 116-390 Village Boulevard Princeton, New Jersey 08540-5721

(609) 452-8060 (609) 452-9550 Fx mark.lauby@ nerc.net

Documents

Transmission Availability Data System Automatic … Availability Data System... · This report covers Phase I Automatic Outage data2. ... example, only one region in NERC has DC Circuits